<script setup lang="ts">
import {reactive} from "vue";

type personsType = {
  name: string,
  age: number
  height: number
}

const persons = reactive<{ arr: personsType[] }>({
  arr: []
})
console.log(persons.arr[0].age)
</script>

<template>
  <div>

  </div>
</template>

